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Display Tree questions

I have several questions on scripting display trees.

1. I was trying to build an interface using the following code
script1=expr( column dialog(...));
script2=expr(column dialog(...));

New window( button box("button 1", script1), button box("button 2", script2));
I found that the program works if I run it each time and click on either button. However, if I run the script, clicking on button1, it always works, then clicking on button 2 (without rerun the program), button 2 doesn't work anymore. And there is no error msg whatsoever displayed on the log. What could be the possible reason to cause this situation?

I was suspecting the problem is caused by using modal dialog box, but I can't quite change them to non modal ones since I'm using Edit Num( ) and Edit Text( ) in script1 and script2.

2. If I'm using Col List Box( ), is there any way like "min column( )" to make the box show "required" instead of "optional"?

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Re: Display Tree questions

Found the bug in my script. I mistakenly cleared global variables somewhere in my script, which caused the subscripts associated with the buttons invalid.
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